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प्रश्न
Match the atomic number 2, 4, 8, 15 and 19 with each of the following
1) A solid non metal belonging to the third period.
2) A metal of valency 1.
3) A gaseous element with valency 2.
4) An element belonging to Group 2
5) A rare gas.
उत्तर
| Atomic number | |
| A solid non-metal belonging to the third period | 15 |
| A metal of valency 1 | 19 |
| A gaseous element with valency 2 | 8 |
| An element belonging to Group 2. | 4 |
| A rare gas | 2 |
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संबंधित प्रश्न
Elements in the same group show the same valency. Give scientific reason.
The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.
Two elements ‘A’ and ‘B’ belong to the 3rd period of Modern periodic table and are in group 2 and 13, respectively. Compare their following characteristics in tabular form:-
(a) Number of electrons in their atoms
(b) Size of their atoms
(c) Their tendencies to lose electrons
(d) The formula of their oxides
(e) Their metallic character
(f) The formula of their chlorides
Write the number of vertical columns in the modern periodic table. What are these columns called?
What happens to the metallic character of the elements as we go down in a group of the periodic table?
How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this way?
name the elements in period 1.
Arrange the following as per instruction given in the bracket.
Cs, Na, Li, K, Rb (decreasing electronegativity)
(a) Fill in the blanks and rewrite the completed statements:
(i) ________ group in the periodic table contains elements that are all gases at room temperature.
(ii) Very fine particles mainly scatter ______ light.
What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?
